What is H Bridge ? Why its used in electronic systems ?

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What is H Bridge ? Why its used in electronic systems ?
Also what's the benefit of connecting H Bridge circuit across the inverter output ?


thanks
 

The H bridge is a circuit that can invert the load current's direction from a DC supply. The inverter circuit operation is based on the H bridge. A 'frequency inverter' is, by definition, a circuit that converts a DC bus in an AC bus, using a H bridge to do it.
 

  • An H bridge is an electronic circuit that enables a voltage to be applied across a load in either direction. These circuits are often used in robotics and other applications to allow DC motors to run forwards and backwards.
  • An H bridge is built with four switches (solid-state or mechanical).
  • A common use of the H bridge is an inverter. The arrangement is sometimes known as a single-phase bridge inverter. The H bridge with a DC supply will generate a square wave voltage waveform across the load.
For a purely inductive load, the current waveform would be a triangle wave, with its peak depending on the inductance, switching frequency, and input voltage.
 

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